ANACIIIS. 153 



C. YOLDINA, Duclos. PI. 54, fig. 48. 



Shell with large rounded ribs, forming an obtuse shoulder to 

 the whorls ; lower part of body-whorl with revolving grooves 

 and chocolate-color, rest of surface whitish, with a violet band, 



visible on the spire. Length, 12 mill. 



Habitat unknown. 



Figured but not described, and not since identified; it is 

 possibly an extreme variety of the last species. 



C. COSTELLATA, Sowb. PI. 54, figs. 28-31. 



Shell narrowly longitudinally ribbed, sometimes slightly tubcr- 

 culate on the shoulder of the body-whorl ; yellowish brown closely 

 reticulated with chestnut or chocolate, forming an irregular 

 darker band above the periphery, and a broader one below it ; 

 aperture bluish, and sometimes reticulated within ; outer lip 

 slightly dentate, sinuous behind. Length, 16-20 mill. 



Mazatlan; Panama; Guatemala (f); Payta, Peru. 



Nearly intermediate in its characters between C. rugosa, Sowb., 

 and C. fluctuata, Sowb. C. valida, Reeve Tfig. 29), from Gua- 

 temala, is described from a worn specimen of this species. G. 

 varicosa, Gaskoin (fig. 30), is also a synonym ; its locality, Payta, 

 Peru, is probably erroneous. I add also C. macrostoma (Anton) 

 Reeve (fig. 31), erroneously said to inhabit the coast of California. 



C. FLUCTUATA, Sowb. PI. 54, figs. 32-35. 



Shell wide ovate, with somewhat turreted spire, nodulously 

 ribbed, ribs sharp, curved on, the body-whorl, or sometimes 

 obsolete below the shoulder ; white, with close, zigzag chocolate 

 markings ; epidermis yellowish, translucent, thin ; outer lip 

 broadly sinuous behind, callously thickened, and minutely 



dentate within. Length, 16-21 mill. 



Panama. 



The synonyms are C. fluctuosa, Duclos (fig. 33), G. suturalis, 

 Gray (fig. 34), C. costata, Duclos (fig. 35). 



C. CORONATA, Sowb. PI. 54, figs. 36, 3T. 



Shell yellowish white, sometimes stained with chestnut, with 

 zigzag longitudinal dark chestnut or chocolate lines ; urjper part 

 of whorls coronated, the tubercles sometimes giving rise to short, 

 distant longitudinal plications. Length, -5 -'75 inch. 



Panama to Cape St. Lucas. 

 20 



